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I am having difficulty understanding moments and equilibrium.

I have attached a diagram of a sample problem. The red Arrows are T1 resolved into X and Y components.

Let's say that I want to find the equilibrium equation for the moments about A and B. I realize that forces going through the point (although there is none in this particular diagram) are zero at that point. I also realize that this process is going to involve multiplying the force times it's distance relative to the point of which the moment is about.

So in other words, finding the equilibrium equation of the moments about A, it would be something like

Moments about A: (600N)(2M) (T1sin(theta))(5m) (100N)(3.25M)

But what I struggle with is determining which are negative and which are positive. I really have struggled grasping the right hand rule, and that's likely my problem.

Any help/advice/criticism would be greatly appreciated.

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# Calculating Moments, Equilibrium

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